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Do not build this. And this one deserves more than a technical answer.

The product is a database of people — names, direct telephone numbers, employers — assembled without those people providing it. It is the most expensive entry in this catalogue and the one with the sharpest legal edge.

WHY IT IS THE LOWEST SCORE HERE
- You cannot rebuild it: it is decades of accumulation across many sources
- You should not attempt to. In the EU and the UK this is personal data, processing it needs a lawful basis, and 'we bought it' is not one. Direct telephone numbers raise it further
- This vendor has been the subject of regulatory attention and litigation over exactly this. The exposure sits with whoever uses the data

WHAT TO DO INSTEAD, AND IT WORKS BETTER THAN PEOPLE EXPECT
- **Publish something worth contacting you about.** Inbound is slower to start and does not decay, and the addresses arrive with consent attached
- Your own mailbox and CRM already hold everybody you have dealt with, with dates and context no database has
- Companies publish a great deal deliberately: the website, the job postings, the public filings. That is free, legal, and often more current
- Ask. An address given to you is worth several that were bought

WHAT YOU CAN BUILD
- A record of your own relationships, filled by read-only mailbox and calendar sync so nobody types anything. That is under Attio and Folk elsewhere in this catalogue
- A watch on the public signals that matter to you — a company's job postings, a funding announcement, a technology change on their site. Those are genuine buying signals, they are public, and a small scheduled job collects them

THE ONE-LINE VERSION
The database cannot be built and should not be used casually. Build the record of people you actually know, and take advice before using anything bought.